considering its running stably now thats a good idea, because as psada said high FSB's can mess up much more than the chip
as he said there are people that keep their FSB's low an raise the multiplier very high, which I have seen lead to faster computing.
but the flip side is, a higher fsb in condunction with faster ram speed can give you a much greater performance boost.
Generally start with a low multilier and raise the fsb until the computer is no longer stable (run 3d mark or some other highly demanding software) if you lower the fsb

ci ratio you may be able to clock it even higher
then lower it by a few mhz (I cannot say for sure but I have heard than keeping it alittle below the maximum greatly increases lifespan)
then raise the multiplier until the same thing happens. (the only complication is that a jump of .5 may run you 75mhz faster so keep an eye on the temperature reading)
but remember with amd processors try your best to keep ram and fsb clocks synchrounous. Remember reading all those articles saying how bad ddr400 was? that was because the chips they were using had an FSB of 333 which is clearly not realated to 400, if they had overclocked to a fsb of 200, ddr400 would have shown its worth.